CVE-2026-50263
MEDIUM EPSS 3.4%
Published Jun 5, 20263w ago · Modified Jun 24, 20265d ago
5.5 CVSS 3.1
Published Jun 5, 2026 3w ago
Last Modified Jun 24, 2026 5d ago
Description
A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None
Threat Intelligence
EPSS Exploit Probability
3.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available
Weaknesses 1
CWE-416 Use After Free Memory Safety
Affected Products 6
References 11
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:26562
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:26566
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:26590
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:26610
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:26709
- access.redhat.com https://access.redhat.com/errata/RHSA-2026:28923
- access.redhat.com https://access.redhat.com/security/cve/CVE-2026-50263
- bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2485388
- gitlab.freedesktop.org https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05
- lists.x.org https://lists.x.org/archives/xorg-announce/2026-June/003702.html
- redhat.atlassian.net https://redhat.atlassian.net/browse/PSIRTSUPT-16950
Remediation
- gitlab.freedesktop.org https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05